When completing SBS setup on the final server during a Swing It! migration this error halts setup.

Solutions are: Bypass trust check

1. Start SBS setup process
2. Cancel
3. Locate Sitxxx.tmp temp (%temp%) Directory
4. Open Setup.sdb in text editor
5. Comment out the trust check line
6. Save and continue the setup process from the Sitxxx.tmp directory

Or change GUID on the replica DCs

1. Regedit - HKLM - Security - Permissions - Add Administrators - Full Control
2. Cmd - cd c:\windows\program files
3. nltest/domain_trusts/all_trusts/v
4. Record domain GUID string
5. Regedit - HKLM\SECURITY\Policy\PolDnDmG - change GUID to earlier recorded value - restart
6. Undo permission changes

See KB909639 and article at smallbizserver.net